On Wed, 31 Dec 2008, Mike Prager wrote:
I hope to use the plotmath facility to print titles that mix
math and values of R variables.
The help for "plotmath" has an example, which after repeated
reading, I find baffling. Likewise, I have read the help file
for "substitute" (wqhich seems to be needed) without ever
understanding what it does, other than being used in some magic
incantations.
I would like to do something like this:
dev.new()
aa <- round(pi,2)
plot(1:3, 1:3, main = ~ a == aa)
It has another example, too, along these lines:
plot(1:3, 1:3, main = bquote(a == .(aa)))
You have to follow a couple of 'See Also' links from the plothmath page to
get to
?bquote
HTH,
Chuck
and have the main title read "a = 3.14"
but of course it reads "a = aa".
From a user's point of view -- one who has never written a
parser nor taken a course in compilers -- what is needed is the
nonexistent function "value" usable in plotmath expressions to
produce the value of its argument, as
plot(1:3, 1:3, main = ~ a == value(aa))
How can this be done?
THANKS!
--
Mike Prager, NOAA, Beaufort, NC
* Opinions expressed are personal and not represented otherwise.
* Any use of tradenames does not constitute a NOAA endorsement.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:cbe...@tajo.ucsd.edu UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
